Asajj isn't in cantina shipments, but anyway, if I was in your position, I'd save them, or go for Asohka if you still need want 7* Yoda but don't have the Jedi needed. If you have enough 7* Jedi, there's no point in going for Asohka.
I am in the same boat, just finished my qgj. Don't find getting poe's 7th star to be worth while and I also find daka over rated. So I went to hrs from scratch even though I have Ashoka at 4 star already.
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Even on a none rebel team? How is he on arena defense?